A shooting at a Florida high school has left 17 people dead, the local sheriff has confirmed. The suspected shooter has been detained.

A lone attacker opened fire outside Marjory Stoneman Douglas High School near the end of the school day, then proceeded inside and continued shooting. He left 17 people dead and at least a dozen injured, Broward County Sheriff Scott Israel confirmed to the media.

Twelve of the deceased victims were found inside the school building, two were found just outside and one in the street nearby. Two more people have succumbed to their wounds in the hospital.

The injured victims were taken to Broward Health Medical Center and Broward Health North hospital.

Multiple ambulances, police cars and even armored vehicles were deployed to the school as the incident unfolded.

The shooter, identified as 19-year-old former student Nikolas Cruz, "was taken into arrest without incident," the Sheriff said. He was armed with an AR-15 rifle and possibly other weapons. "He was not a current student," Israel said. "I don't know why he left, I don't know when he left."

One of the school's students, caught up in the shooting, posted pictures from a classroom where he and his fellow students were hiding behind desks.

The second thing to remember is that the efficiency of the fighting units be kept at a premium.

The fighting units must be held under the tight control and supervision of the ranking officials.

So whether this (the above so-called shooting and killing event) is a legitimate, actual event or a 'staged drama', is rather irrelevant, the important thing being that it (the above so-called shooting and killing event) be presented and utilized for maximum mind control.

Whether you are confined to a local unit with local officials presiding, or if you are in the wider global field of presentation, always obey your senior officials. Trust what you are being told, in the order that it is being told to you.

Your duty is to enhance your senior officials glory and ego certification, as they and we 'fight' to gain control over the earth and wrest the earth away from its natural elements. As you do this, for your senior officials, their wealth and their power becomes more and more obscene.

As their wealth becomes more and more obscene and their glory and might become ever more pretentious, you will receive your certified and bankable paycheck at the end of the day.

And this is all the mind controlled unit and fighting soldier needs to really know.

Always perform capably for your leaders. Operate solely as a fighting unit should, you will be rewarded.